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A New Generation of Porous Asphalt Pavement – OGFC Support Study
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2025-06-01
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[PDF-2.60 MB]
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Edition:Final Report 05/2020 – 8/2023
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Abstract:The objective of this study was to develop and evaluate a new generation of open-graded friction courses (OGFC) that would provide superior durability performance while preserving the functional benefits of the mix. Additionally, a Finite Element (FE) model was developed and used to propose new air voids (AV) guidelines for OGFC applications in Louisiana. Nine OGFC mixes that encompass three Warm-Mix Asphalt (WMA) additives, two pozzolanic fillers (cement and fly ash), and a mix with a reduced nominal maximum aggregate size (NMAS) of 9.5 mm, were evaluated. The most cost-effective OGFC mixes were the mix with reduced NMAS, the mixes prepared with the pozzolanic fillers, and two of the WMA additives. Based on the findings of this project, revision of the Louisiana specifications is recommended to address durability issues with OGFC mixes. It is recommended that the new AV requirements for OGFC mix be 16-20% instead of the current 18- 24%. Additionally, the specifications should be modified to incorporate the use of OGFC mixes with 9.5 mm NMAS. The use of WMA additives and pozzolanic fillers is also recommended for enhanced performance and durability.
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